Paradise Datacom P300 Series Installation & Operating Handbook page 231

necessary (eg if the data itself contains long strings one ones) you can disable the detection of AIS and resulting actions
using Change, User-Opt, Operation, Actions, AIS.
5: Check if this line is connected in the cable and supported by the connected device. If the line is floating (no cable/not
supported) then it might `float` to the off state and intermittently raise this alarm.
6: The modem generates a temporary backup bearer for the Insert mux when set to Loopthrough only if there is no bearer
available. Should the operator assume the modem is set to Generate not Loopthrough , and feed the Rx bearer output
back to the Tx bearer input (including via other equipment), then it will oscillate. Temporarily generating a backup
bearer when there is no bearer incoming, then as this temporary bearer is detected at the Tx input when fed back to the
modem, it will switch off this temporary bearer and return to Loopthrough mode whereupon as there is now no source
for the bearer (it s a compete loop), it will fail again and switch back temporarily to generating a backup bearer. If you see
the modem displaying a bearer status switching between Rx Fault: Ins mux bearer frame sync lost , Rx Fault: Insert
bearer AIS, generating , and / or Rx Fault: No insert bearer, generating , then check that the bearer is not set to
Loopthrough AND at the same time looped back to the modem Tx input, even if via other equipment.
7: If the user control Thin Route Spoof (Change, User opt, Operation, Terr/Sat, Thin Route Spoof) is set to On to spoof
full bearer connectivity when passed over a Thin Route satellite circuit (ie not the whole bearer data rate), then a CAS
backward alarm incoming on the Rx Input is passed to the terrestrial as a terrestrial Multiframe backward Alarm (SD). If
Thin Route Spoof is not active, the warning is still displayed but no actions are taken (ie SD is not generated).
8: You might try to clear the unit's non-volatile memory and then reconfigure the unit from scratch. From the main menu
select 0, then User Parameters, Clr All + Reset. If this fails contact the factory for an RMA number then return the unit for
repair. If the unit will not boot to allow you to select from the screens, you can also clear the memory by powering up the
unit while holding in the `NO` key (but you have to hold the key in until the unit gives its normal three beeps).
9: If you wish to use Drop/Insert, and pass the incoming satellite timing to the downstream network, this is only possible by
setting the Rx Insert bearer to Generate not Loopthrough (Change, Rx, Baseband, Insert dialogue), and selecting Rx
Clock as Satellite (Change, Rx, Buff/Clock, Gen Bearer Clock). If the downstream equipment requires a terrestrial TS16
Multiframe, you must configure the modem to use CAS, so the generated bearer has a TS16 multiframe.
P300H P300 Series Modem Installation and Operating Handbook Page 231